drop dead vs succumb

drop dead and succumb both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop dead	No	No	Yes	No
succumb	No	No	Yes	No

As verbs, succumb is a hyponym of drop dead; that is, succumb is a word with a more specific, narrower meaning than drop dead:

drop dead: pass from physical life and lose all bodily attributes and functions necessary to sustain life
succumb: be fatally overwhelmed

Other hyponyms of drop dead include abort, asphyxiate, stifle, suffocate, buy it, pip out, drown, predecease, famish, starve, fall, yield.

drop dead (verb)	succumb (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	consent reluctantly
	be fatally overwhelmed